You must update your TIN and apply for a TIN transfer. To do this, you must submit to your prevailing RDO /RDO of your previous employer 1) 3 copies of duly filled Form 1905 and 2) 3 copies of duly filled BIR Form 1901. Your employer was the one who enrolled you, or got the TIN...
In addition, you also have to accomplish BIR Form 1905 to transfer your TIN registration. Change your registered address and transfer to the appropriate RDO where you do your business and have jurisdiction over you. You can find your respective RDO here. 3. Pay the Certificate of Registration ...